Can I use my pending i485 and i765 to go to school and work part-time?

Yes, as long as you have a pending I-485, you can go to school and you can work with the EAD you received as part of your I-485 application.

First, once it is approved, your Form I-765 Work permit will allow you to work temporarily [1 yr] while your I-485 [green card] application is pending. Second, once it received your I-485 application, your F-1 student visa becomes effectively void since a F-1 visa and a Form I-485 are in conflict. Any previous violations of your F-1 visa is effectively forgiven based on your marriage to a US citizen and your I-485 application. The only issue you want to look into may be the continuing validity of your right to a scholarship and if your change of status from F-1 to green card holder may or may not have imperiled that scholarship.

I am assuming that you are now a student but not of an F-1 status because you have an immigrant petition pending. Since you have filed an I-765 application, once that is approved and you have your EAD card, you should be able to work. Legally, you are authorized to stay because of your pending I-485, however, without the EAD card, you are not allowed to work.

You can legally work part time as soon as your I-765 application is approved. You should speak with the school to determine if they will allow you to begin attending classes in the meantime.